Paper container



Sept. 6, 1932. A.l H. BEDWORTH PAPER CONTAINER Filed June 25, 1951 iPatned sept. 6, 1932 UNITI-:1b STATESA PATENT OFFICE( ARTHUR H.EEDWOETH, or ,EvERETm MASSACHUSETTS, ASsICNon, To SPECIALTY AUTOMATICMACHINE CCMPANY, or CHELSEA, MASSACHUSETTS, A CORPORATION FMASSACHUSETTS the bottoms, that Will not permit the contents to leakout. l i

While the invention is illustrated as at thev bottom of a round orcylindrical container,

it is to be understood that I do not limit my-l self thereto as the samestructure could be utilized for the tops of paper containers, or evenfor the ends of containers which are other than round in cross section.

Heretofore, so far as I. am aware, paper cups or bottles or other papercontainers, especially of cylindrical form, are not reliably leak-proofbecause, owing to the various methods of making andthe variations in themanufacture of paper, it is almost impossible to make a leak-proofcontainer becauseL of difficulty in having the various closely fittingportions formed together under pressure so that said portions willconform to each other closely and tightly. y

The object of my present invention is to vprovide paper containers withend closures the marginsv of which are soconvolutedfin an Inter-engagedand com 'ressed manner as to effectually prevent l'ea age at any pointofsaid-margins.

With said object In view, my Invention consists in the Ycontainers4having end closures constructed' substantially as hereinafter/describedand claimed.

Of the accompanying drawing which is von a considerably enlarged scalein order tov clearly illustrate the differenty members of the container,Y) f Figure 1 is a side elevation, partly brgken out or in section, ofthebotto'm portion ofa container in its first condition or step ofconstructon. v-

Figures 2, 3 and-4 are similar views,illus trating Successive steps ofconstruction, vthe last of said figures illustrating the finishedstructure. p Y w Similar reference characters indicate similar parts oryfeatures in all of the views.

Referring first to vFigure l, the cylindrical with a'minimum amount'ofwastage. And 100 Application led .Tune 23, 1931. Serial No. 546,252.

PAPER CONTAINER or tubular body member,a has inserted -a short'distancewithin one end thereof, adisk b having a marginalr ange c. If and whenany adhesive is employed as hereinafter described, such adhesive may beeither applied to the flange c or to the inner surface of the lowerportion ofthe body -member a before the disk b is located in theposition illustrated in said Figure 1. I do not find it essential,however, to employ any adhesive, because the lsubsequent operations tobe described pro-v duce a bead having such interlocked and comy pressedmembers as to very effectively pre' vent the existence of any crevicesthrough which any liquid can pass.

The next step in the construction of the container is to turn the edgeportion d of the body a inward and up inside the flange c as lillustrated byFigure 2, and then a second nor outer disk e whichv hasbeenpreviously formed with a marginal flange f is inserted close to thedisk fb with its flange f fitting closely inside the edge of thein-turned portion d of the body, to bind said edge as illus- 1 trated-by Figure 3.

Finally, by anyy suitable crimping mechanism, all of the portions whichextend below the edge of the flange f are turned inwardly and compressedinside said iange` f, said iange and also the layers of material outsidesaid iiange being also subjected to compressionto ensure the severallayers remaining in thetriple-thick condition illustrated by Figure 4.This'beading operation effects such interlocking of portions of the twodisks and the body member that an effective tight seal is obtainedwithout employing any adhesive.

- I f adhesive is desired, suitable glue will bef preferably applied-Varound the interior of the body member a overzsuch area thereof vthatwhen the body yportion d is turned in to the position shown in Figure 2,both Sides or surfaces of the disk flange c will be adhesively elsewhereif'desired.

By the structure illustrated Iand descrlbed,-

the following advantages are obtainedz- A perfect 4leak-proof closure isobtained connected. Of course glue canibe vapplied 'cost ofmanufacturing operations.

under actual construction the paper lends itself to ya tight crimpingwhich is necessary to make a leak-proof closure/at a minimum From,Figure 4, itwill be understood that a bottom closure produced asdescribed, will prevent leakage because, in order for any contents toleak or seep through, such contents would have to travel through anextensive path, and su'ch path is ,tightly formed or compressed. rlhisadvantage results mainly from the important. feature that both of theflanges of the two disks b and e are rolled or crimped within a portionof the body of the container,

and are compressed therein. Another way l of explaining the advantageover any paper container known to me is that themarginal flanges of theinner and outer disks b and 'e `being enclosed by a portion 0l of thebodyl a,

provides a triple-thick rim or bead at the bottom of the container.

Having now ldescribed my invention, l

1. 'A paper container .having an end closure comprising inner and outerdisks, the inner disk having a marginal flange enclosed by a 4portion ofthe body of the container and providing a triple-thick rim, and theouter disk havin a marginal portion enclosed by the said triple-thickrim. l l

2. A paper container comprising a body having an inwardly-turned endportion, a disk having a marginal flange enclosed in saidinwardly-turned portion of the body, and a second-disk having 'amarginal flange, the

said inwardly-turnedv portion of the body and the disk lange thatiisenclosed therein being crimped over the flange of the said second disk.4

3. A'paper container comprising a body member/having an end closureconsisting of .two disks each having an outwardly turned marginalilange,'the flange 'of the inner disk being enclosed in an inwardlyturned portion of the body member, and the flangeofl the outer diskbearing against the edge of said inwardly turned portion of the bodymember, the said inwardly turned portion of the body member and theinner disk flange which is enclosed thereby being rolled inwardly andlocking the flange of the outer disk in position.

lln testimony whereof ll have aliixed my signature.

ARTHUR BLEDWORTH.

